Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4918c6106ae120f…

MALICIOUS

PDF

109.5 KB Created: 2021-07-26 04:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b92cbae32c8d936d92196ab9219b0923 SHA-1: b1586a7ece3cbd9692fe4297d12106563dbf3aee SHA-256: b4918c6106ae120fd42f865072218071c40a9d6ff3348fa827a560ab95eae6fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soechi.net/userfiles/file/87815060638.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db76c899c53---99437265634.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b178ff55---7277574335.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/tetefovazufo.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/numole.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60971930927.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/maxot.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a5652603---wagexedusezopatavinuxuw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e57f854b66c4de6bc15adbadddb2303/89338138309.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/76448804998.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e96c4082264a9d62852711cf47150ce9/3282407104.pdfIn PDF document text
    • http://sushi-belovo.ru/files/84400517180.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/34315505155.pdfIn PDF document text
    • http://sciattella.net/images/file/39289116282.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/vakagokupewimobisajade.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160828e6395740---nodijozaxuboja.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/tafumavelexitubigulorebik.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f9705a2fb6e9da1c22f2528ff4015a82/85549165944.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/75642043325.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/86655363137.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/70a57e7c71d054d288859d6200f8c2b3/ximegerusiliniv.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/72943375247.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lagejiluxifeloped.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4928e2d6---67352942253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+story+of+peter+pan+and+wendyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8F 10620 bytes
SHA-256: 32b68540d6d4610a4c337a6db0ed74e22fccc86b3111fa047110bb9cc115d508
font_01_sfnt_off000162ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFF 17128 bytes
SHA-256: b029ec124c0792d1e5865385724a332934f4f8314bef9ad58992d2105478f8e1